162 
Fishery Bulletin 117(3) 
Table 6 
Estimates of survival (S) and total instantaneous mortality (Z) of rainbow smelt (Osmerus mordax ) 
sampled in 4 coastal rivers of Massachusetts in 2005-2007 for this study and of rainbow smelt in 
previous studies. For all data sets, annual age keys were applied to length-frequency data, and age data 
from sample years and sexes were combined and applied to the Chapman-Robson age-based survival 
estimator with age-1 fish excluded. 
Sampling 
location or type 
Years 
Source 
n 
S(SE) 
Z (SE) 
Fore River 
2005-2007 
This study 
2762 
0.12 (0.004) 
2.11 (0.03) 
Saugus River 
2005-2007 
This study 
1427 
0.11(0.008) 
2.23 (0.07) 
Jones River 
2005-2007 
This study 
526 
0.08(0.011) 
2.52 (0.14) 
Parker River 
2005-2007 
This study 
803 
0.10(0.010) 
2.27 (0.10) 
Trawl survey 
2004-2007 
This study 
517 
0.10(0.013) 
2.28 (0.12) 
Miramichi River 
1949-1953 
McKenzie, 1964 
18,072 
0.28 (0.003) 
1.27(0.01) 
Parker River 
1974-1975 
Murawski and Cole, 1978 
1595 
0.16(0.008) 
1.82 (0.05) 
Jones River 
1979-1981 
Lawton et al., 1990 
34,268 
0.18 (0.002) 
1.71(0.01) 
Table 7 
Regression coefficients from length-weight analysis (log-transformed total length and total weight data) 
for rainbow smelt (Osmerus mordax) sampled in Massachusetts in 2004-2007 in marine waters during a 
trawl survey and at the Fore River and Saugus River with fyke nets. SE=standard error; i? 2 =coefficient 
of multiple determination; I=immature rainbow smelt with undetermined sex. 
Sampling location 
or type 
Sex 
Age 
n 
Intercept (a) 
Slope ( b) 
Slope SE 
R 2 
Fore and Saugus 
F 
All 
353 
-13.11 
3.20 
0.03 
0.96 
Rivers combined 
M 
All 
899 
-12.88 
3.14 
0.02 
0.97 
Fore River 
F 
All 
285 
-13.12 
3.21 
0.04 
0.96 
M 
All 
597 
-12.81 
3.13 
0.02 
0.97 
F 
1 
76 
-11.28 
2.83 
0.13 
0.87 
F 
2 
159 
-12.55 
3.10 
0.12 
0.81 
F 
3 
43 
-13.97 
3.37 
0.18 
0.89 
Saugus River 
F 
All 
68 
-13.08 
3.19 
0.08 
0.96 
M 
All 
302 
-12.96 
3.15 
0.03 
0.97 
F 
1 
28 
-15.30 
3.63 
0.25 
0.89 
F 
2 
39 
-10.16 
2.64 
0.25 
0.75 
Trawl survey 
F 
All 
277 
-14.23 
3.41 
0.04 
0.96 
M 
All 
215 
-14.59 
3.47 
0.05 
0.96 
I 
All 
59 
-12.76 
3.09 
0.14 
0.89 
F 
2 
76 
-13.48 
3.26 
0.10 
0.94 
0.5 and 0.6, and values were similar to those estimated 
by Chen (1970), except immature rainbow smelt from the 
trawl survey had an average factor <0.5. Females had 
higher values than males for each sampling location in 
Kruskal-Wallis rank sum tests: % 2 =170.41 (Fore River), 
X 2 =38.57 (Saugus River), x 2 =34.40 (marine waters), df=l, 
P<0.001. Kruskal-Wallis multiple comparison tests found 
the condition factor for males from the Saugus River to be 
lower than that for males from both the Fore River and 
marine waters, but among females, only rainbow smelt 
from the Fore River and trawl survey had different values 
(the factor for samples from the Fore River was higher). 
Fulton’s condition factor for age-2 females differed for all 
locations (Kruskal-Wallis rank sum test: x 2 = 17.71, df=2, 
